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FilledSmallSquareNullWords is an option for Read and related functions which specifies whether null words should be taken to exist between repeated word separators.

FilledSmallSquare With the default setting NullWords -> False, repeated word separators are treated like single word separators.

FilledSmallSquare See The Mathematica Book: Section 2.11.8.

FilledSmallSquare See also: TokenWords, RecordSeparators.